Spark-plug.



E. C. RAUGH,

SPARK PLUG.

APPLICATION FILED AUG. 25, 1909.

Patents@ Nov. s, www

atto/anew ELMER c.r RAUCH, or 00EUR DALENE, IDAHO.

SPARK-PLUG.

Specification of Letters Patent.

Patented Nov. 8, '1910.

Application filed August 25, 1909. Serial No. 514,622.

To all whom it may concer-n: i

Be it known that l, Enum: C. RAUCH, a citizen of the United States,residing at Coeur dAlene, in thc county of Kootenai and Stateofldahmhave invented a new and useful Spark-Plug, ot which the followingis a specification. n'

This invention has reference to improvements in spark plugs forproducing a spark by the vpassa-ge of an electric current betweenseparated terminals located within an explosion chamber to cause theignition of an explosive charge therein. l p

-The object of the presentinvention 1s to include in a spark plugthe'means for cans ing the generation of a current producing Aa sparkbetween the circuit terminals lodged within the explosion chamber.

It is customary in the make and break type ofA spark plugs to completean electric circuit by bringing the electrodes within the explosionchamber in electrical Contact and then by thesudden' separation of theterminals to rupture the circuit so thatthe selfinduction of the circuitdue to the presence of a self-induction coil included in the circuitshall cause the Generation of a high potential current ofsnfticientquantity to-bridgelthe spark gap caused by the separation of:the circuit terminals within the explosion chamber in the form of a fat,-hot spark which will ignite the explosive charge in the usual manner. l

ln accordance with the present invention there is a magnet forming apart of the spark plug and arranged to bring cli-cuit tcrlninals in theexplosion chamber together and then the circuit exterior to the sparkplug is ruptured causing the denergization of the magnet and theseparation of the spark plug terminals, thus` producing the spark. l

The invention will be best understood from a consideration of thefollowing detail description taken yin connection with the accompanyingdrawings orn'iing a part of thisspecification .in which drawing there isshown a central longitudinal section of a spark plug embodying theinvention, the showing being on anenlarged scale, and there also bei-ngshown a diagranmiatic rcpresentation of the electric circuit.

Referring to the drawings, there is indij cated at 1 a ortion of theWalls of an explosion cham er through which Wall there 4tive terminal isindicated. `at 5.

is passedY the threaded,enti?52W the body 'portion 3 of a spark plug.This body p0rtion has a central longitudinal passage 4 and the end ofthe threaded portion 2 eX- tending intothe explosion chamber consti-'tutes one of the active terminalsof the spark plugas will hereinafterappear.

Theouter'end of the body 2 is enlarged and lprovided with screw threadsy-it'or the reception ofa cap nut 6 having ene end reduced in diameteras indicated at? and provided with a central perforation. Thereisprovided a coil S in the form vvof a solenoid wound upon an insulatingspool 9, Within which is a core 10 of magnetic material throiwh which'is a central passage 11 enlarge(4 at o ne end as shown at 12 andprovided at the enlarged end with internal screw threads as indicated at13. The core 10 extends at one end beyond the corresponding end of thecoil. 8 and there is provided with a circumferential flange 14 ofgreaterV in place.

Extending through the central passage 11 This acof the core 10 from theend thereof comcident with the passage 4 through the ,body 3v of thespark plug to the enlarged portion 12 of the said passage through thecore 10, is a ro'd 16 tormcdfat'the. end cntcrmg the extension 12 ofthepassage 11 into a head 17.

This rod extends entirely through thcpassage 4t and beyond thev terminalor electrode 5 an'd there is bent at an angle as shown at 18 to formai'iotherelectrode or terminal capable of moving into contact with theterminal 5. The end of the passage 4 remotefrom the terminal 5 isenlarged circuinferentially as indicated at 19 and this nd is closed bythe corresponding end of iecore 4t. Fast on the rod 16 in operativearmature block 2Q, the purpose of which will presently appear. Appliedto the threaded outer end of the core 10 is a screw plugQl between whichand the head `17 there elation to the corresponding end of the core' iO'ffand lodged iii' the enlargement 19 is an i is lodged a spring 22housed within the portion 12 of the internal bore of the core 10. Theplug 21 extendsbeyond the outer end ot the core and there receives athumb nut 22E designed to cla mp a comluctor to the core l0.

At some convenient point there is loi-ated a battery-24L or other sourceotl electric current and on one side this battery is connected by aconductor 25 to the walls of the explosion chamber 1 in the particularshowing of the drawings and on the other side the batteryl is connectedby a conductor 26 to a circuitv controller-27 or' the make and breakltype, the other side of .which is connected by areonduetor 2S to thecoil 8 by means of a binding post The other side of the coil 8r is`directly connected to the core 10, while the core l0 is connectedv by aconductor 30 to thewallso the explosion chamber 1.

"Sinee'spa-rk' plugs are customarily employed in connection withexplosion engines it maybe assumedy that the circuit controllingfdevice27 is driven by a rotatinglpart of the'engine in proper timed relation.Every time the circuit controller 27 causes a closure of the `circuitthere is established a circuit which may be traced as follows:Proceeding fromthe battery-24, the current will' pass by wa" of theconductor 26 to thecircuit co'ntro ler 27` thence by conductor-28 to the-coil 8:'and from the latter to the core lO'and.

then returning t'o the batter through the conductor 30, Wallsof the eXposi'on chamber 1 andconductor 25. This will cause the energization ofthe coil 8 andthe magnetizaa? spark between the said terminals, and

causing. the tiring of a charge Witlnnthe eX-4 plosion chamber in theusualI manner.

Vhile the spark plug has been described as provided with ar single coil8, this does not/preclude the use ofa double coil'. for thesam'elpurpose, but, formanufacturing reasons-the single coil; ispreferable since theA 'lril'igpin \\'orks through the center ot' itanditis easier to protect and cheaper to Amamitactureand has beenfound'etlieient in praetice.- The-rod or pin 1G is madeotsuitablenon-magnetic material'whlle the armature?4 20 will ofcourse be made ofvmagnetic` material.y rlhe screw- 2l provides a means not j only forclosing the outer end of the spark' plug` against escape ot the gases ofcombustion, but alsoprovides a means tor adjusting the tension of thespring-'22.

4 sat/asf lVl'iat is claimed is y 1. A spark plug of the make and breaktype, comprising a body portion adapted to enter an ignition chamber andthere constituting one terminal ot' the plug, said body portion having alongitudinal passage therethrough enlarged at the end remote from theignition chamber, and an eleetromagnet mounted on the body portion ofthe plug, a core for the magnet provided, with a longitudinal passageenlarged at the outer end and there Screw threaded, a tiring pin eX-tending through the body portion of the plug into the hollow core andthere formed Iwith an enlarged end housed in the enlarged portion of thepassage through the core, said tiring pin carrying within the enlargedportion of the passage through the body of the plug an armature inoperative relation to the core and at the end remote froml the endwithin the core'extending beyond ther ignition chamber end of the bodypor-tion of the plug and there bent at an angle to constitute a terminalof the plug in operative relation to the terminal at the ignitionchamber end of the body portion of the plug, a closure for the enlargedend of the core provided With Screw threads adapted to the threaded endof the passage through the coreI and a spring housed in the core andcompressed between Athe-closure and the-enlarged. end` of the firingpin, said spring tendingV to maintain the tiring pin in open circuitposition.

2. A spark plug comprising a body portion provided with an axial passageenlarged at one end, a magnet mounted on the body portion, a core forthe magnet projeeting beyond one end' thereof and there provided. witha. circumferential tlange, a cap-nut on the end of the body portion ofAthe plug and interposed between the same and the adjacent endo'f themagnet, said cap nutinclosing saidlange, insulating material between thebody portion'of the plug and the flange on the core and also between thesaid flange andthe cap nuta rod extending through the passage in thebody ofthe plugand into and movably along the core and formed at one endintoa ycircuit terminal in operative relation tothe explosion chamberendof the bodyportion ol. the plug, and an armature carried by the rodwithin the enlarged portion of the passage through the body of the plugin operative relation to the corresponding end ofthe core.

' In testimony that I claim the foregoing as my'own, I have heretoaffixed my signature'in the presencey of two witnesses.

ELMER (l. ltAUUll.

fitnessesz T. V. CAsn, A. L. Ration.

